diff --git a/pyerrors/input/sfcf.py b/pyerrors/input/sfcf.py
index 13017369..f263fc24 100644
--- a/pyerrors/input/sfcf.py
+++ b/pyerrors/input/sfcf.py
@@ -610,7 +610,7 @@ def _check_append_rep(content, start_list):
     has_regular_len_heads = True
     for chunk_num in range(len(start_list)):
         start = start_list[chunk_num]
-        if chunk_num == len(start_list)-1:
+        if chunk_num == len(start_list) - 1:
             stop = len(content)
         else:
             stop = start_list[chunk_num+1]
@@ -621,7 +621,7 @@ def _check_append_rep(content, start_list):
                 break
         header_len_list.append(header_len)
         data_len_list.append(len(chunk) - header_len)
-    
+
     if len(set(header_len_list)) > 1:
         warnings.warn("Not all headers have the same length. Data parts do.")
         has_regular_len_heads = False
@@ -653,7 +653,6 @@ def _read_chunk_structure(chunk, pattern, b2b):
     return gauge_line, corr_line, start_read, T
 
 
-
 def _read_append_rep(filename, pattern, b2b, im, single, idl_func, cfg_func_args):
     with open(filename, 'r') as fp:
         content = fp.readlines()
@@ -674,10 +673,10 @@ def _read_append_rep(filename, pattern, b2b, im, single, idl_func, cfg_func_args
 
         for chunk_num in range(len(chunk_start_lines)):
             start = chunk_start_lines[chunk_num]
-            if chunk_num == len(chunk_start_lines)-1:
+            if chunk_num == len(chunk_start_lines) - 1:
                 stop = len(content)
             else:
-                stop = chunk_start_lines[chunk_num+1]
+                stop = chunk_start_lines[chunk_num + 1]
             chunk = content[start:stop]
             if not has_regular_len_heads:
                 gauge_line, corr_line, start_read, T = _read_chunk_structure(chunk, pattern, b2b)